Discuss the historical changes in the three economic sectors?

After independence to 1972 primary sector was prominent in Indian GDP.

1. As farming method improves and surplus food was produced people channelized their energy towards manufacturing.
2. Very soon secondary sector gained prominence
3. Because of development of primary and secondary sector, information and technology, trade, transport etc, tertiary sector gained prominence.
4. In 2011-12 share of tertiary sector in Indian GDP was approximately 60%.

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